I see people on the forums mentionning rumours and heresays about famous pianists especially considering technique...
For example I heard some stupid rumour that horowitz got buried with a copy of hanon, and I also read that rachmaninov knew hanon inside and out in all keys.
These two were known pranksters, and these kind of things sound exactly like what a troll would say. Especially the rach thing about Hanon, I can totally imagine him answering questions about technique and formation being like "Yes, we learn Hanon by heart in all keys!! lololol"